Sinker



June 26, 1945. c, PA E 2,378,946

SINKER Filed May 26, 1942 8g .9 Z. Page 26g 4 v attorney.

Patented June 26, 1 945 fsmxnn w c ne L. Page, Philadelphia, Pa.

ApplicationMay 2s, 1942,Serial No. 444,565

2 Claims. 'o1.,66- -7) The presentinvention relates to improvementsinsinkers and methods of operation.

In accordancewithpresent methods, in circular,

knitting'machines'the' stitch is drawn by the needle over-the regularstitchdrawing platform of 1' the sinker, following which the rear wallofthe sinker throatipushes the stitch over the hook of theneedle-without releasing the pressure on the yarn. Consequently whenknitting a tight stitch and changing yarns the tendency is to cut thefabric due to the overlappingof the twoyarns making-a double thicknessfor thesi nkers to push against without any compensating relief; The

only alternative isto slackenthe stitch.

Another source of trouble results from the V- I shape formed bythe latchand the cheek of the needle at the lower part of the yarn eye. When thestitch is being drawn the regular. drawing platform of thesinker comesin contact with the stitch previously drawn on the needle. andcloses thelatch before the needle is drawn low enough on the stitch cam for theyarn being fed into the needles to escape being trapped into V-formationof the yarn eye; especially on synthetic yarns,

the fibers often being pinched orcut and causing a frayed appearanceandweakening of the fabric.

The invention aims to eliminate these difliculties resulting in theproduction of a finer and smoother fabric which can be produced withoutthe enumerated troubles. I

With the foregoing and other objects in view the invention will be morefully described hereinafter and more particularly pointed out in theappended claims.

In the drawing in which like partsare denoted by the same referencecharacters throughout the severalviews:

Figure l is a side elevational view of an improved sinker constructed inaccordance with the present invention showing a fragment of a needle ashaving just drawn a stitch.

Figure 21s a similar view showing the subsequent positions of the sinkerand needle with the yarn on the inclined wall of the sinker.

Figure 3 is a, similar view showing a third sequence position of theparts with the yarn on.

the resting platform,

Figure 4 is a similar view showing the yarn en- I gaged with the rearwall of the sinker throat.

Referring more particularly to the drawing l0 designates generally asinker of a standard or conventional form in common use at the presenttime, modified for the purposes of the present invention, suchmodification consisting generally of a low stitch drawing platform ll,an inclined wall I 2 and a resting platform I3 which is, or may be, atgenerally the horizontal elevation of the standaid or conventionalstitch drawing platform of the present day sinker. The throat of theimproved sinker is indicated at I4 and its back wall atl5. W

The needle is. designatedgenerallyat l6 and the needle latch at H.,Ir'rEigure l. the-.stitchis designated at!!! and in. Figures 2, 3 andAthe same .isshown in. its subsequent positions at lag,

I8 andl8..

It will be seen that,according to the invention,

the stitch drawingplatform II is a l oW; platform compared to theregular orstandard stitch draw ing platform of conventional .sinkersfortthe: pure pose of drawing a shorterstitch l8. As an example, I cutthis platform down fifteen thousandths of an inch from the height of theregular platform in a forty-eight gauge sinker and have securedexcellent results, although I do not wish to be restricted to thisprecise figure. For a seventy gauge sinker ten thousandths of an inchcut down gives good results.

In operation, Figure 1 shows the full draw of V the needle as making ashort stitch over the com paratively low stitch drawing platform H. As

the needle is being raised by the side cam and.

the second needle is drawing a stitch over the next sinker, the firstsinker is moving forward, as indicated in Figure 2, to cause therearwardly inaction takes up the slack caused by the rising needle,pushes the yarn to the back of. the needle hook and holds it in thatposition to prevent the second needle from robbing any of the slackyarn.

The continued forward motion of the sinker raises the stitch l8 to thelevel of the high resting platform l3 which position is shown in Figure3. In this condition the pressure is released from the yarn and thestitchis allowed to equalize any undue stress put uponit between theneedles and sinkers, and this condition exists until the rear wall l5 ofthe throat is moved forward to set the stitch on the needle.

Thus there is produced what may be termed a double pushing actiondeveloped by inclined wall l2 and rear wall l5 witha rest period betweenproduced by the resting platform l3. This arrangement reduces to. aminimum the strain put upon the yarn when drawing the stitch. When thenext course of stitches is drawn, the first course is pushed over thehook of the needle by the pressure exerted by the rearwardly inclinedsinker wall [2, and when the hook of the needle is raised to the levelof the high resting This needle by moving the rearwardly inclined sinkerwall against the yarn; the third step to release the pressure when thestitch is raised to the level of, and enters upon, the high restingplatform i3 of the throat; and the fourth step to set the stitch on theneedle by movement of the rear wall I 5 against the same.

Only one sinker at a time pushes on the yarn after the stitch is drawnby the needle. The low stitch drawing platform ll allows the needle Hito be drawn lower on the stitch cam before the latch is closed by thestitch on the needle, the yarn being fed higher in the yarn eye. Thisfeature helps to preventtrappin-g of the yarn between the latch andcheek of the needle when the stitch is being drawn.

The invention involves a substantially horizontal stitch drawingplatform on a lower plane than the resting platform of the throatdisposed forwardly of a rearwardly-inclined wall extending upwardly fromthe stitch drawing platform to the resting platform, the restingplatform also being horizontal and extending rearwardly from the apex ofthe rearwardly-inclined wall to the slightly rounded rear wall of thethroat; the rear wall extending upwardly from the resting platform tothe roof of the throat; and the throat 1 roof extending forwardly fromthe apex (top or highest point) of the rear Wall and rounded at theother end to formthe nose of the sinker.

What is claimed is:

1. An improved sinker comprising one of an identical complement ofsinkers of which a sinkerring consists, said sinker having a drawingplatform lower than standard positioned relatively to a needle to enablesaid needle to draw on said drawing platform a stitch shorter thanstandard, an' inclined wall extending upwardly from the rear edge of thelow drawing platform, a high resting platform extendingrearwardly fromthe upper edge of the inclined wall, a throat, a rear throat wall, athroat roof, and a sinker nose, said resting platform being short in thedirection of movement of the sinker, said rear wall being close to therear end of said inclined Wall, said inclined wall being wholly withinsaid, sinker nose.

2. A sinker comprising one of identical sinkers composing a sinker ring,each of said sinkers comprising a sinker nose having a rounded underforward portion, a horizontal throat roof, a vertical back wall,slightly rounded where it isjoined to the throat roof and the highresting platform, a high resting platform, a throat formed by the highresting platform, vertical back wall and throat roof, an inclined wallsloping gradually from the forwardedge of the short high restingplatform down to a point lower than the customary drawing platform, bothsaid high resting platform and said inclined wall being within theoverhanging confines of said nose, and a low 7 drawing platformextending forwardly from the forward lower end of said inclined wall onwhich to draw a shortened stitch.

CHARLES L. PAGE.

